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Old 10-09-2012, 12:04 PM   #1
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Lex and YACC on fedora 17

Im trying to execute a lex program.But, when i compiled it using the code below:
lex filename.l
It is not accepting yylex().For that line it is showing error as 'unrecognised rule'.Help me please....
Old 10-09-2012, 09:30 PM   #2
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I haven't tried this but here is an answer.

step 1: For installing lex and yacc
yum install flex bison
yum install flex
yum install byacc
[if  "yacc -d filename.y" doesn't work try" bison filename.y"]
step 2: For installing c compiler
yum install gcc
Good Luck!
- Raj
Old 10-10-2012, 09:41 AM   #3
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lex will call flex with -l option and maybe giving this output. Try:
$ flex filename.l
Old 10-10-2012, 09:51 AM   #4
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Thanks for your help Rupadhya.It worked well with yacc.But for lex programs,It is again showing error in the line yylex() as
unrecognised error

Last edited by shambhavi; 10-10-2012 at 09:53 AM.
Old 10-10-2012, 09:59 AM   #5
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Originally Posted by reuti
lex will call -l option and may be giving this output
Thanks for your help.I tried it.It is not working.
Old 10-11-2012, 10:09 AM   #6
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It sounds like the real error is in the syntax of your lex source file. Please reduce it to the least amount of code that still reproduces the problem, and post it here (use [CODE][/CODE] tags to preserve formatting).
--- rod.


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